Female teacher Reiko (Ichijo) is in the prime of her life. She finds her job as a teacher rewarding and enjoys harmonious days with her students. On holidays, students who can't study are called home and special supplementary lessons. Reiko is deeply touched when she sees a student who responds earnestly to her careful teaching. It's been a year since my husband left home for a single job, and even though I know it's bad, my body is in the prime of my life. Unable to suppress the pain in my body, I cross a line that should not be crossed. However, the affair is known to a certain student...